1. Department of Surgical Gastroenterology, Hvidovre Hospital, University of Copenhagen, Hvidovre, Denmark;
2. Department of Public Health Programs, Randers Regional Hospital, Randers, Central Denmark Region, Denmark;
3. Department of Surgical Gastroenterology, Bispebjerg Hospital, Copenhagen, Denmark;
4. Department of Clinical Biochemistry, Hillerød Hospital, Hillerød, Denmark;
5. Belgian Volition SPRL, Namur, Belgium